Vista works here,freezes there.!!!!!!!

64,000.00 dollar question. I built a vista home system for a friend. It freezes up in media player,on the internet,or just whenever it feels like it at his house but will run all day long when i bring it back home,no matter what i do with it. I've noticed 2 things about his house. He trips breakers now and then with the whole second floor going out. He also has a cb with antenna on roof over top of this room. Also i loaned him a pc with xp pro on it and he has no problems with it. Both computers have 1 gig ram xp is a 160 gig ide drive vista is a 160 gig sata 300 drive they have identical dvd burners